Why we flood: Capricious climate complicates river regulation

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By Ryan Tumilty, CBC News Ottawa, May 30, 2019

The Carillon dam is the Ottawa River's final drain.

Water from every one of the river's many tributaries and reservoirs — every drop from its vast watershed — eventually flows through the hydroelectric power station's gates, about 130 kilometres east of the capital.

On April 30, when the river reached this spring's peak, a record 9.2 million litres surged through the dam each second, enough to fill nearly four Olympic-size swimming pools. That's more water than cascades over Niagara Falls.